I'm running 8x17 ET ~~38 on the front and 9x17 ET~~~33 maybe les on the back - I'm not sure exactly what offet I'm running because I build my wheels from a few others sets, mixing lips and barells.
All wheels have 205/40, on the front little, nearly no strech, on the back masive srech.
Car is lowered low, really low, can not tel how low compare to the standart suspension, buy I would say sump is 3' from the floor.
Front wheels are still in the arches - they are not sticking out, rear one are in the same line like rear arches.
Im gona order a spacers to push wheels little bit out - front 15 - 17mm so I will get ET~~20 and put some smaller tyres to have more strech 195/40, and about 15mm spacers on the back so I would get ET~~15-16
And I would get a car lowet about 10-15mm on the front and 20-25 on the back
About 4th gen - 4th gens arches are much wider than 5th gens, that for sure, know people who have had 4th gen and than
upgrade their car for 5th gen and fit the same set of wheels - wheels sticking out.
On polish forum is a bloke who lowered his 4th gen the same level how I did my, he running 9x17 ET 25 and As far I remember he put some some pacers 10mm on the front and 20 o the back to have wheels in the same line like his arches
Hope this help

p.s.
I thing it is my longest post on this forum (except group buy):D

:D